A gang of Asian muggers stole a 13-year-old boy's mobile phone in a knifepoint robbery.

The boy was walking into Sainsbury's in Duncombe Street, Bletchley, on January 4 when he was approached by three males who blocked his path.

One of the gang pulled out a large knife and demanded the boy's mobile phone before running off towards Bletchley bus station. Police are appealing for witnesses to the incident which happened around 6.30pm.